Introduction to java Programming

INTRODUCTION TO
PROGRAMMING WITH
JAVA
Lecture : 1

 - What is Programming ??
 Programming languages such as : C++ , C , Python ,
Java … [high . low].
 Java Technology:
Programming Language
● As a programming language, Java can create all
kinds of applications that you could create using
any conventional programming language.

 A computer can’t understand our language It’s just understand
Something called : Binary System 0 (s) & 1 (s) .
 So we have something called Compiler {Transelator}
 What is Compiler (translator from our language to Computer’s Language ..
)
 JVM {java Virtual machine}.
 What is JDK “java Development Kit ” ?
 It’s include the Compiler , Interpreter and most tools that it’s necessary to
complier our code .
 Also it’s include the libraries and classes which we going to use like “Scanner ,
System ” .
 You can download it from .. Oracle.com

• Conversion from Decimal to binary :
For Example : 130 , 300 .
- From left to right >> with every sub process put 1 .
128
27
64
26
32
25
16
24
8
23
4
22
2
21
1
20
130 – 128 = 2
1
0 0 0 0 0 2 – 2 = 0
1
0
300 – 128 =
172 !!

 IDE’s {Editor’s}
 Note pad & any word pad
 The most Famous is “Net Beans & Eclipse”

 How to create any Project ??
1. Press file >> New Project
2. Java Application
3. Project Name
4. Main class
Note : your file will be in your workspace …

Hello ,World “First Program”
 System.out,println(x); just print the value of x ..
 System.out.println(“x”) ; print litter x ..
 Sout the Tab “Short cut ”

 Println = print then make a new line .
 Print = just print .
 We can make a new Line also by n “inside quotes” .
 We can make any operation in the printing statement .
such as : 1+2 ,, 1*5 ,, an so on .
- (your name) every part in separate line by using println and n .
- print something like that“1 + 5 =” 6 .
Your turn

Printf :
 It’s a method for printing but it’s easier
 For Example
Note the Difference :

 %s >> it means you are going to Enter String Value .
 %d >> means that you are going to Enter Decimal number .
 %n = n >> to Make a new line ..
NOW LET’s Try ..
Welcome to
Java Programming!
5+5 = 10
Your turn

System.out.printf("%s %n %s %n %s %d" , "Welcome to","java Programming! " , "5+5" ,10);
//Error ;)

 For right Number
 Byte
 Short
 Int
 Long
 Decimal Number :
 Float
 Double
 Character >> char
 Boolean {true or false }
String …
Example .. Sum
Variables & identifiers .. : )

Input / Scanner
SCANNER INPUT = NEW SCANNER(SYSTEM.IN);

Comparison Operations
 When you make any comparison you will need some of these Operands :
 x == y , x >= y , x <= y , x > y , x < y .
Logic Operations : { && , || , ! }

 Examples on if Condition and logic Operations
,,
Calculator again { + , - , * , % , / }
Fail & pass { if <50 : Fail ,, }
Comparison between two numbers x , y ;
Even or Odd
Absolute
number divisible by 5 or no ..
Comparison between three Numbers
Your turn

Imagine that you want to print your
name 50 times ..
System.out.println(“Ahmed Ayman ”);
…………………………….

Loops !
FOR, NESTED LOOPS
FOR STRUCTURE
FOR(INT COUNTER = 1 ; COUNTER <= 50;COUNTER++) //+1
{
//CODE SUCH AS PRINT (“AHMED AYMAN”);
}

For Structure
 for(INITIALIZATION ; CONDITION ; ITERATING STEP)
 {
 //Loop body
 }
 Examples
 Print your Name 10 Times .. Try it
 From 1 to 100 with printf .. And reverse it .
 Numbers which can divide by 5 .
 Multiplication table

 Nested Loops ,,
For ( ; ; ){
For ( ; ; ){
}
}

Multiplication Table ..
int x = 0 ;
for (int i = 1 ; i <= 12 ; i++)
{
for (int j = 1 ; j <= 12 ; j++)
{
x = i * j ;
System.out.println(i+"*"+j+"="+x );
}
System.out.println("n");
}
}

Introduction to java Programming

Introduction to java Programming

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